Activities of bacteria

Activities of bacteria - otherwise. In the human intestine,...

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Activities of bacteria Bacteria play many beneficial roles in the environment. For example, some species of bacteria live  on the roots of pod-bearing plants (legumes) and “fix” nitrogen from the air into organic compounds  that are then available to plants. The plants use the nitrogen compounds to make amino acids and  proteins, providing them to the animals that consume them. Other bacteria are responsible for the  decay that occurs in landfills and the other debris in the environment. These bacteria recycle the  essential elements in the organic matter. In the food industry, bacteria are used to prepare many products, such as cheeses, fermented dairy  products, sauerkraut, and pickles. In other industries, bacteria are used to produce antibiotics,  chemicals, dyes, numerous vitamins and enzymes, and a number of insecticides. Today, they are  used in genetic engineering to synthesize certain pharmaceutical products that cannot be produced 
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Unformatted text preview: otherwise. In the human intestine, bacteria synthesize several vitamins not widely obtained in food, especially vitamin K. Bacteria also often break down certain foods that otherwise escape digestion in the body. Unfortunately, many bacteria are pathogenic; that is, they cause human disease. Such diseases as tuberculosis, gonorrhea, syphilis, scarlet fever, food poisoning, Lyme disease, plague, tetanus, typhoid fever, and most pneumonias are due to bacteria. In many cases, the bacteria produce powerful toxins that interfere with normal body functions and bring about disease. The botulism (food poisoning) and tetanus toxins are examples. In other cases, bacteria grow aggressively in the tissues (for example, tuberculosis and typhoid fever), destroying them and thereby causing disease....
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